CN102206744A - Method for granulating sinter mixture - Google Patents
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Abstract
The invention discloses a method for granulating a sinter mixture. The method is characterized in that: the method comprises the following steps: a first mixture is mixed with rich ore powder and a flux to obtain a second mixture, and the second mixture is granulated; the first mixture comprises the flux, fuel, and water, and also comprises/does not comprise the rich ore powder; the rich ore powder in the first mixture accounts for 0 to 50 wt% of the rich ore powder in the second mixture; the flux in the first mixture accounts for 40 to 80 wt% of the flux in the second mixture; and the second mixture comprises 1000 to 1800 parts by weight of the rich core powder, 40 to 75 parts by weight of the fuel and 40 to 100 parts by weight of water relative to 100 parts by weight of the flux.
Description
Technical field
The present invention relates to the method that a kind of sinter mixture is granulated.
Background technology
Exist in the iron ore concentrate sintered at home and abroad production and how further improve the mixture granulation performance, thus the problem of raising bed permeability and sintering mineral products, quality.Up to now, following several sintering technologies have been researched and developed both at home and abroad, for example, document CN85100645A discloses a kind of iron ore concentrate sintered technology that is used for, promptly two basicity TYPE MINI-PELLET SINTERING TECHNIQUE, it is characterized in that the iron ore concentrate separated into two parts, press blast furnace slag making basicity and slag performance demands, the fine mill flux (Wingdale, wagnerite) of desired number is allocated into respectively in two portions iron ore concentrate, make the bead of particle diameter less than two kinds of different basicity of 5 millimeters, and then add suitable fuel, and behind the uniform mixing, sintering on the sinter machine of packing into.NKK develops a kind of HPS sintering technology, and its step comprises: the first step is made ball, and fine iron ore and fusing assistant are mixed into mixture, and this mixture is made ball becomes raw pellet ore; Second step was made ball, in raw pellet ore, add coke powder, make the raw pellet ore that scribbles coke powder by making ball, perhaps can further raw pellet ore be sieved and by size grading, add coke powder in each group ore particle and the addition by quantitatively making coke powder strengthens along with the increase of each ore particle group particle diameter, then with each group raw pellet ore coating; The raw pellet ore that will scribble coke powder is at last put into fire grate sinter machine sintering, sees document CN87108122A.Document CN1924035A discloses a kind of iron ore concentrate composite agglomeration technology, the granule iron concentrate that it is characterized in that accounting for all iron-bearing material per-cents and be 30-60 weight % adds binding agent and fuel is prepared burden, mixing, and compound is made the pelletizing that diameter is 8-16mm in balling disc; Prepare burden accounting for meal ore deposit that all iron-bearing material per-cents are 70-40 weight % and other iron-bearing materials and flux and fuel; With pelletizing and secondary compound mixing, on sinter machine, carry out cloth then, igniting, sintering, whole grain after cooling off is made the complex sintered lump ore of being made up of acidic pellet ore embedding high basicity sinter.
More than three kinds of technology improving the sinter mixture pellet performance, improving and obtained certain effect aspect the agglomerate yield and quality, but these technology are only applicable to the less common iron ore concentrate of granularity or the pelletization of ground hematite.
(particle diameter only is about 50 weight % less than the grain size content of 0.074mm for having coarse size, and the particle diameter of common iron ore concentrate is general all more than 70 weight % less than the 0.074mm grain size content), size composition unreasonable (grain size content is many in the middle of the 0.074-0.25mm that is unfavorable for granulating), the vanadium iron magnetite concentrate of characteristics such as wetting ability difference (Flos Bombacis Malabarici v-ti magnetite concentrate for example, it is that ferric charge is up to the rich ore powder more than the 60 weight %), because this iron ore concentrate coarse size, wetting ability is poor, it is difficult to cause sinter mixture to be granulated, permeability of sintering material bed is poor, and therefore the effect of using above-mentioned three kinds of technology to obtain is comparatively limited.
Summary of the invention
The objective of the invention is to have shortcomings such as sinter mixture granulation difficulty and permeability of sintering material bed difference when overcoming the rich ore powder that uses coarse size, wetting ability difference in the prior art, provide that a kind of permeability of sintering material bed is good, technology simple and be applicable to the method that the sinter mixture of suitability for industrialized production is granulated.
The method that sinter mixture provided by the invention is granulated, it is characterized in that, this method comprises mixes first compound with rich ore powder and flux, obtain second compound, then with this second compound granulation, contain flux and fuel and water in described first compound, and contain or do not contain rich ore powder, the amount of rich ore powder is the 0-50 weight % of the amount of rich ore powder in described second compound in described first compound, the amount of flux is the 40-80 weight % of the amount of flux in described second compound in described first compound, in described second compound, with respect to the flux of 100 weight parts, rich ore powder, the content of fuel and water is respectively the 1000-1800 weight part, the 40-75 weight part, the 40-100 weight part.
The method that sinter mixture provided by the invention is granulated has the following advantages:
(1) adopts method of the present invention, improve the ability that rich ore powder adheres to fine granules, reduced in the compound＜content of 1mm powder, improved size composition and the pellet performance of sinter mixture, improve the ventilation property and the sintering velocity of sinter bed, thereby improved the output of agglomerate.
(2) adopt method of the present invention, strengthened the iron ore concentrate granulation, improved the intensity of granulation bead, help the raising of sintered ore rotary drum strength.
(3) adopt method of the present invention, can form local high basicity, promote the generation of high-quality bonding phases such as calcium ferrite, help improving the mineral composition and the structure of agglomerate, improve sintered ore rotary drum strength and yield rate on granulation bead surface.
(4) adopt method of the present invention, can improve the metallurgical performance of agglomerate, help improving the technico-economical comparison of blast-furnace smelting.
Embodiment
The present inventor finds, thick when the granularity of rich ore powder in the sinter mixture, when wetting ability is relatively poor, granulate by the mode that adds rich ore powder and flux in batches, the rich ore powder of participation mixed once and the content of flux have considerable influence to the stability of granulation bead; In addition, the present inventor also finds, if will contain raw materials such as the compound of rich ore powder and flux through granulate earlier after the mixed once again with the compound that contains rich ore powder and flux through the secondary mixing granulation, the ventilation property of resulting sinter bed is still undesirable.
Therefore, among the present invention, the mixture of described first compound for directly obtaining by mixing without granulation.Concrete, the method that sinter mixture provided by the invention is granulated comprises mixes first compound with rich ore powder and flux, obtain second compound, then with this second compound granulation, contain flux and fuel and water in described first compound, and contain or do not contain rich ore powder, the amount of rich ore powder is the 0-50 weight % of the amount of rich ore powder in described second compound in described first compound, the amount of flux is the 40-80 weight % of the amount of flux in described second compound in described first compound, in described second compound, with respect to the flux of 100 weight parts, rich ore powder, the content of fuel and water is respectively the 1000-1800 weight part, the 40-75 weight part, the 40-100 weight part.
By regulating rich ore powder and the consumption of flux and the mode that rich ore powder and flux are added in employing in batches that participates in mixed once, alleviated the destruction of secondary mixing to the granulation bead, strengthened the stability of granulation bead, improve the ability that rich ore powder adheres to fine granules, reduced in the sinter mixture diameter less than the content of the powder of 0.5mm; Simultaneously, improved the ventilation property and the sintering velocity of sinter bed greatly, shortened sintering time by the mode of once granulating.
Although with rich ore powder and flux in above-mentioned amount ranges in batches with addition of realizing purpose of the present invention, further under the preferable case, the amount of rich ore powder is the 0-30 weight % of the amount of rich ore powder in described second compound in described first compound, and the amount of flux is the 40-60 weight % of the amount of flux in described second compound in described first compound.
In the method that sinter mixture provided by the invention is granulated, it is the above iron ore raw materials of the above preferred 60 weight % of 50 weight % that described rich ore powder refers generally to iron level, can be the high TiO of thick (particle diameter is lower than 70 weight % less than the 0.074mm grain size content) of particle
2The type v-ti magnetite concentrate also can be the common iron ore concentrate or the ground hematite of thin (particle diameter is more than the 70 weight % less than the 0.074mm grain size content) of particle.In order to embody advantage of the present invention better, the preferred described rich ore powder of the present invention is that iron-holder is that 50 weight % are above, particle diameter is a iron ore raw material more than the 40 weight % less than the grain size content of 0.074mm.
The present inventor is surprised to find that, the rich ore powder that is the original thicker particle diameter of part or all of granularity that participates in mixed once 3-8mm changes in the fashionable adding of secondary mixing, simultaneously flux by a certain percentage mixed once and secondary mixing fashionable respectively with addition of, mixing granulation in second drum mixer then, the output of the ventilation property of gained sinter bed, sintering velocity, agglomerate can be significantly improved.Reason is that rich ore powder plays the granulation core in sinter mixture, but the bead that the thicker rich ore powder of granularity is made in primary mixer is damaged easily in that secondary mixing is fashionable, therefore adopts the thinner rich ore powder of most of granularity to participate in mixed once; Simultaneously, because the particulate raw material is more in mixed once material of the present invention, so also allocate more flux into, be unslaked lime, utilize the cohesive action of unslaked lime, reach and strengthen the purpose of granulating, so more help improving the balling-up of mixed once material, the bead stability that therefore obtains granulating is fine.
Therefore, in the present invention, even the granularity of rich ore powder to be processed thicker, before mixed once, do not need its do pulverizing is waited special processing yet, only do rough segmentation in case of necessity, promptly, also can reach purpose of the present invention at the thicker rich ore powder of the fashionable adding granularity of secondary mixing.
Because method provided by the invention can handle the thicker breeze of granularity, therefore when preparing first compound, can allocate the assorted material of the thicker iron content of other particle diameters into and/or return mine.The assorted material of iron content that the assorted material of iron content refers generally to produce in the Iron and Steel Production is as gas ash, slag etc.; Return mine and refer generally to after the blast furnace screening, return the agglomerate of agglomerating＜5mm.Usually, the assorted material of iron content, the granularity of returning mine for greater than 0 to smaller or equal to 5mm.In first compound of the present invention, with the assorted material of these iron content, return mine and flux is mixed together, recycle, thereby reach the purpose that effectively utilizes secondary resource.In first compound of the present invention, with respect to the flux of 100 weight parts, the assorted material of iron content, total consumption of returning mine are the 250-350 weight part.
In the method that sinter mixture provided by the invention is granulated, described flux is used to strengthen the viscosifying power of rich ore powder to fine granules, improves the pellet performance of compound.Preferable particle size of the present invention be greater than 0 to smaller or equal to the thinner unslaked lime of 300 microns granularity as flux, reason is, the unslaked lime granularity is very thin, wetting ability is strong, toughness, stick to that the burning to fuel has katalysis on the particle surface, the particle top layer combustionvelocity of can accelerating to granulate improves sintering velocity; The trickle quicklime particles of granularity is produced low melting component easily in addition, and liquid phase flow is good, and it is fast to condense, and can reduce firing rate and zone of combustion resistance.In the present invention, CaO content is preferably more than the 50 weight % in the described unslaked lime.CaO content is high more in the unslaked lime, and is strong more to the catalytic capability of fuel.Therefore further under the preferable case, described in the present invention in the unslaked lime CaO content be more than the 90 weight %, promptly active ash.More preferably, the unslaked lime that adds when the present invention granulates is allocated use into earlier again after adding water digestion, and described unslaked lime is before use with unslaked lime: preferred 1: 0.5 weight ratio of the weight ratio of water=1: 0.4-0.6 adds water digestion.
The fuel that is contained in first compound of the present invention is preferably coke powder or pulverized anthracite, and with respect to the flux of 100 weight parts, the content of fuel is the 40-75 weight part, and the carbon content in the described fuel is 65-84 weight %.Because method provided by the invention improves the ventilation property of sinter bed greatly, improve sintering velocity, shorten sintering time, therefore can obviously reduce firing rate, energy-conservation material-saving.
According to the method that sinter mixture provided by the invention is granulated, under the preferable case, this method comprises that also granulation gained pelletizing is put into the sinter machine mid point burns knot, and be 2.0min ignition time, and the igniting negative pressure is 600mmH
2O, the sintering negative pressure is 1200mmH
2O, sintered layer height are 650mm.
Further specify the present invention below in conjunction with embodiment.
Embodiment 1
This embodiment is used for illustrating the method that sinter mixture provided by the invention is granulated.
Mixed once: 4 kilograms unslaked limes (CaO content is 84 weight %) are added behind 2 kilograms the water digestion 5min and 2 kilograms the assorted material of iron content (gas ash, particle diameter is less than 5mm, iron level is 36 weight %), the 15 kilograms (agglomerate of returning mine, particle diameter is less than 5mm, iron level is 49 weight %), 40 kilograms rich ore powder (Flos Bombacis Malabarici v-ti magnetite concentrate, iron level is 54 weight %, particle diameter is less than 0.074mm) and coke powder (carbon content is 82 weight %) mechanical stirring in primary mixer of 2.9 kilograms, mix, obtain first compound;
Secondary mixes: with 40 kilograms rich ore powders (Flos Bombacis Malabarici v-ti magnetite concentrate, iron level is 54 weight %, particle diameter is 0.074-1.5mm) and 1.0 kilograms postdigestive unslaked lime (CaO content is 84 weight %, wherein use the water digestion 5min that adds 0.5 kilogram in the forward direction unslaked lime) join in above-mentioned first compound, even through the mechanical stirring compound, obtain second compound, drum pelletizer (φ 0.8 * 1.5m then packs this second compound into, Beijing Jindu Metallurgy Mechanism Mill) granulates in, the granulation condition is granulation time 4min, rotating speed is 60r/min, obtains sinter mixture.Wherein the amount ratio of unslaked lime is as shown in table 1 before the rich ore powder of twice use and the digestion.
Embodiment 2
This embodiment is used for illustrating the method that sinter mixture provided by the invention is granulated.
Mixed once: 3 kilograms unslaked limes (CaO content is 84 weight %) are added behind 1.5 kilograms the water digestion 5min and 2 kilograms the assorted material of iron content (slag, particle diameter is less than 5mm, iron level is 36 weight %), the 14 kilograms (agglomerate of returning mine, particle diameter is less than 5mm, iron level is 49 weight %), 20 kilograms rich ore powder (Flos Bombacis Malabarici v-ti magnetite concentrate, iron level is 54 weight %, particle diameter is less than 0.074mm) and pulverized anthracite (carbon content is 80 weight %) mechanical stirring in primary mixer of 2.9 kilograms, mix, obtain first compound;
Secondary mixes: with 60 kilograms rich ore powders (Flos Bombacis Malabarici v-ti magnetite concentrate, iron level is 54 weight %, granularity is less than 1.5mm, be 33 weight % wherein less than the 0.074mm grain size content, particle diameter is 67 weight % for the 0.074-1.5mm grain size content) and 2 kilograms unslaked lime (CaO content is 84 weight %, wherein use the water digestion 5min that adds 1 kilogram in the forward direction unslaked lime) join in above-mentioned first compound, even through the mechanical stirring compound, obtain second compound, drum pelletizer (φ 0.8 * 1.5m then packs this second compound into, Beijing Jindu Metallurgy Mechanism Mill) granulates in, the granulation condition is granulation time 4min, rotating speed is 60r/min, obtains sinter mixture.Wherein the amount ratio of unslaked lime is as shown in table 1 before the rich ore powder of twice use and the digestion.
Embodiment 3
This embodiment is used for illustrating the method that sinter mixture provided by the invention is granulated.
Method according to embodiment 2 is granulated, different is, mixed once and secondary mixing are fashionable, the amount ratio of the rich ore powder that provides by table 1 is prepared first compound and second compound respectively, and the weight of rich ore powder is 4 kilograms (particle diameter is less than 0.074mm) in first compound, the weight of rich ore powder is 76 kilograms (particle diameter is 47 weight % less than the 0.074mm grain size content wherein for greater than 0 to smaller or equal to 1.5mm, and particle diameter is 53 weight % for the 0.074-1.5mm grain size content) in second compound.
Embodiment 4
This embodiment is used for illustrating the method that sinter mixture provided by the invention is granulated.
Mixed once: 2 kilograms unslaked limes (CaO content is 84 weight %) are added 1 kilogram water digestion back and 2 kilograms the assorted material of iron content (gas ash, particle diameter is less than 5mm, iron level is 36 weight %), the 13 kilograms (agglomerate of returning mine, particle diameter is less than 5mm, iron level is 49 weight %) and coke powder (carbon content is 82 weight %) mechanical stirring in primary mixer of 2.9 kilograms, mix, obtain first compound;
Secondary mixes: again with 80 kilograms rich ore powder (Flos Bombacis Malabarici v-ti magnetite concentrate, iron level is 54 weight %, granularity is less than 1.5mm, be 47 weight % wherein less than the 0.074mm grain size content, particle diameter is 53 weight % for the 0.074-1.5mm grain size content) and 3 kilograms unslaked lime (CaO content is 84 weight %, wherein use the water digestion 5min that adds 1.5 kilograms in the forward direction unslaked lime) join in above-mentioned first compound, even through the mechanical stirring compound, obtain second compound, drum pelletizer (φ 0.8 * 1.5m then packs this second compound into, Beijing Jindu Metallurgy Mechanism Mill) granulates in, the granulation condition is 4min for the granulation time, rotating speed is 60r/min, obtains sinter mixture.Wherein the amount ratio of unslaked lime is as shown in table 1 before the rich ore powder of twice use and the digestion.
Embodiment 5
This embodiment is used for illustrating the method that sinter mixture provided by the invention is granulated.
Method according to embodiment 2 is granulated, different is, mixed once and secondary mixing are fashionable, and only the usage ratio of the rich ore powder that provides by table 1 is prepared first compound and second compound respectively, and do not distinguish the particle diameter of rich ore powder, the amount ratio of mixed once and the fashionable unslaked lime of secondary mixing is constant.
Embodiment 6
This embodiment is used for illustrating the method that sinter mixture provided by the invention is granulated.
Method according to embodiment 5 is granulated, and different is that selected rich ore powder is common granule iron concentrate (iron level is 54 weight %, and particle diameter is 100 weight % less than the 0.074mm grain size content).
Table 1
Comparative Examples 1
According to the amount ratio shown in the table 1, with the iron content assorted material (gas ash of the unslaked lime of 80 kilograms rich ore powders and 5 kilograms (using after adding 2.5 kilograms water digestion 5min) with 2 kilograms, particle diameter is less than 5mm, iron level is 36 weight %), the 15 kilograms (agglomerate of returning mine, particle diameter is less than 5mm, iron level is 49 weight %) and 2.9 kilograms coke powder (carbon content is 82 weight %) in mixing machine, mix, even through the mechanical stirring compound, make compound even, drum pelletizer (φ 0.8 * 1.5m then packs into, Beijing Jindu Metallurgy Mechanism Mill) granulate in, the granulation condition is granulation time 4min, rotating speed is 60r/min, obtains sinter mixture.
Comparative Examples 2
Method according to embodiment 1 is granulated, different is, the rich ore powder consumption that participates in mixed once is 75 weight % of its gross weight, and participating in secondary blended rich ore powder consumption is 25 weight % of its gross weight, and the amount ratio of mixed once and the fashionable unslaked lime of secondary mixing is constant.
Comparative Examples 3
Method according to embodiment 1 is granulated, different is, the unslaked lime consumption that participates in mixed once is 20 weight % of its gross weight, and participating in secondary blended unslaked lime consumption is 80 weight % of its gross weight, and the amount ratio of mixed once and the fashionable rich ore powder of secondary mixing is constant.
Performance test
Embodiment 1-6 and the Comparative Examples 1-3 pelletizing that obtains of granulating is distributed into sintering in the sinter machine, and be 2.0min ignition time, and the igniting negative pressure is 600mmH
2O, the sintering negative pressure is 1200mmH
2O, sintered layer height are 650mm.Testing laboratory adopt the method for sieve screening record compound＞3mm grain size content and＜the 0.5mm content of powder; Calculate sintering velocity according to bed depth and sintering time; Pour out after agglomerate is burned, carry out naturally cooling, fall 2 times, sieve, get＞the percentage ratio meter yield rate of 10mm grain size content from the 2m eminence; Get the 10-40mm grain size content and adopt the 1/2ISO drum unit to measure sintered ore rotary drum strength, sieve with the 6.3mm standard sieve at last, get＞percentage ratio of 6.3mm grain size content represents sintered ore rotary drum strength; The arithmetical av of getting the weight percent of each grain size content of agglomerate is a median size.The mensuration of low-temperature reduction disintegration energy is undertaken by GB13242-91, and reducing gas consists of CO30 volume %+N
270 volume % get less than the weight percentage of 3.15mm grade and make cryogenic reducting powder index (RDI); In warm reducing property measure and undertaken by GB13244-91, reducing gas consists of CO30 volume %+N
270 volume %, the reduction degree index when getting 180min are reduction degree index (RI).
The method of calculation of above-mentioned leading indicator are as follows:
(1) sintering velocity V (mm/min)
V＝h/t ①
(2) yield rate y (%)
y＝M
1/M ②
(3) utilization coefficient P (t/m2h)
P＝(M
1/1000)·(1/A)·(60/t) ③
(4) tumbler index TI (%)
TI＝M
2/M
3 ④
Formula 1.-4. in:
The h-bed depth, mm;
The t-sintering time, min;
M
1-＞10mm finished product agglomerate weight, kg;
M-agglomerate gross weight, kg;
M
2Behind-the rotary drum＞and 6.3mm grade weight, kg;
M
3-go into sample weight before the rotary drum, kg;
A-sinter machine area, M
2
The performance perameter of the agglomerate that embodiment 1-5 and Comparative Examples 1-3 make is shown in table 2 and table 3.
Table 2
| ＞3mm grain size content, % | ＜0.5mm content of powder, % | Median size mm | Sintering velocity mm/min | Barrate strength＞6.3mm, % | |
| Embodiment 1 | 64.70 | 6.50 | 4.65 | 23.51 | 74.50 |
| Embodiment 2 | 63.94 | 6.97 | 4.42 | 23.01 | 74.14 |
| Embodiment 3 | 64.20 | 6.83 | 4.56 | 23.25 | 74.32 |
| Embodiment 4 | 63.41 | 7.55 | 4.18 | 22.76 | 73.89 |
| Embodiment 5 | 63.20 | 7.83 | 4.06 | 22.65 | 73.82 |
| Embodiment 6 | 63.37 | 7.76 | 4.10 | 22.70 | 73.79 |
| Comparative Examples 1 | 61.03 | 9.60 | 3.84 | 22.14 | 73.68 |
| Comparative Examples 2 | 61.25 | 9.83 | 3.80 | 22.05 | 73.53 |
| Comparative Examples 3 | 61.38 | 9.56 | 3.72 | 22.10 | 73.62 |
Table 3
| Yield rate, % | Utilization coefficient, t/m 2·h | Cryogenic reducting powder index, % | The reduction degree index, % | |
| Embodiment 1 | 74.46 | 1.380 | 62.01 | 82.75 |
| Embodiment 2 | 73.88 | 1.362 | 62.51 | 81.87 |
| Embodiment 3 | 73.94 | 1.367 | 62.28 | 82.22 |
| Embodiment 4 | 73.07 | 1.351 | 63.14 | 81.31 |
| Embodiment 5 | 72.94 | 1.347 | 63.48 | 81.22 |
| Embodiment 6 | 73.00 | 1.349 | 63.52 | 81.26 |
| Comparative Examples 1 | 71.71 | 1.336 | 64.37 | 80.97 |
| Comparative Examples 2 | 71.64 | 1.330 | 64.50 | 80.64 |
| Comparative Examples 3 | 71.58 | 1.331 | 64.43 | 80.75 |
From the result of table 2 and table 3 as can be seen, do not adopt original production process of the present invention to compare with Comparative Examples 1, embodiment 1 gained sinter mixture＞3mm grain size content increases by 3.67 percentage points,＜0.5mm powder descends 3.10 percentage points, median size increases 0.81mm, sintering velocity improves 1.37mm/min, sintered ore rotary drum strength improves 0.82 percentage point, yield rate improves 2.75 percentage points, utilization coefficient increases by 3.19%, the agglomerate cryogenic reducting powder index descends 2.36 percentage points, and the reduction degree index improves 1.78 percentage points; Embodiment 2 gained sinter mixture＞3mm grain size content increases by 2.91 percentage points,＜0.5mm powder descends 2.63 percentage points, median size increases 0.58mm, sintering velocity improves 0.87mm/min, sintered ore rotary drum strength improves 0.46 percentage point, and yield rate improves 2.17 percentage points, and utilization coefficient increases by 1.91%, the agglomerate cryogenic reducting powder index descends 1.86 percentage points, and the reduction degree index improves 0.9 percentage point; Embodiment 3 gained sinter mixture＞3mm grain size content increases by 3.17 percentage points,＜0.5mm powder descends 2.77 percentage points, median size increases 0.72mm, sintering velocity improves 1.11mm/min, sintered ore rotary drum strength improves 0.64 percentage point, and yield rate improves 2.23 percentage points, and utilization coefficient increases by 2.27%, the agglomerate cryogenic reducting powder index descends 2.09 percentage points, and the reduction degree index improves 1.25 percentage points; Embodiment 4 gained sinter mixture＞3mm grain size content increases by 2.38 percentage points,＜0.5mm powder descends 2.05 percentage points, median size increases 0.34mm, sintering velocity improves 0.62mm/min, sintered ore rotary drum strength improves 0.21 percentage point, and yield rate improves 1.36 percentage points, and utilization coefficient increases by 1.11%, the agglomerate cryogenic reducting powder index descends 1.23 percentage points, and the reduction degree index improves 0.34 percentage point; Embodiment 5 gained sinter mixture＞3mm grain size content increases by 2.17 percentage points,＜0.5mm powder descends 1.77 percentage points, median size increases 0.22mm, sintering velocity improves 0.51mm/min, sintered ore rotary drum strength improves 0.14 percentage point, and yield rate improves 1.23 percentage points, and utilization coefficient increases by 0.82%, the agglomerate cryogenic reducting powder index descends 0.89 percentage point, and the reduction degree index improves 0.25 percentage point; Embodiment 6 gained sinter mixture＞3mm grain size content increases by 2.34 percentage points,＜0.5mm powder descends 1.84 percentage points, median size increases 0.26mm, sintering velocity improves 0.56mm/min, sintered ore rotary drum strength improves 0.11 percentage point, and yield rate improves 1.29 percentage points, and utilization coefficient increases by 0.96%, the agglomerate cryogenic reducting powder index descends 0.85 percentage point, and the reduction degree index improves 0.29 percentage point.
As seen from the above analysis, the method that adopts sinter mixture provided by the invention to granulate, the main performance perameter of gained agglomerate all is significantly improved, and especially sintering velocity reaches as high as 23.51mm/min (shown in embodiment 1).This shows employing method of the present invention, and the ventilation property of sinter bed improves greatly, and sintering time further shortens.
It can also be seen that from the result of table 2 and table 3, among the embodiment 1-3 part or all of granularity the rich ore powder of thick (particle diameter is 0.074-1.5mm) be placed on the fashionable adding of secondary mixing, the ventilation property of the sintering velocity of gained agglomerate, yield rate and sinter bed obviously is better than the effect of embodiment 4.The result of embodiment 5 shows, adopt method of the present invention also to be applicable to common granule iron concentrate sinter mixture granulation, and the ventilation property of the yield rate of gained agglomerate and sinter bed all is better than adopting the agglomerate of existing prepared.
Claims (10)
1. the sinter mixture method of granulating, it is characterized in that, this method comprises mixes first compound with rich ore powder and flux, obtain second compound, then with this second compound granulation, contain flux in described first compound, fuel and water, and contain or do not contain rich ore powder, the amount of rich ore powder is the 0-50 weight % of the amount of rich ore powder in described second compound in described first compound, the amount of flux is the 40-80 weight % of the amount of flux in described second compound in described first compound, in described second compound, with respect to the flux of 100 weight parts, rich ore powder, the content of fuel and water is respectively the 1000-1800 weight part, the 40-75 weight part, the 40-100 weight part.
2. method according to claim 1, wherein, the amount of rich ore powder is the 0-30 weight % of the amount of rich ore powder in described second compound in described first compound, and the amount of flux is the 40-60 weight % of the amount of flux in described second compound in described first compound.
3. method according to claim 1 and 2, wherein, the amount of rich ore powder is 0 weight % of the amount of rich ore powder in described second compound in described first compound, described first compound by with flux and fuel and water is mixed must, with respect to the flux of 100 weight parts, the consumption of fuel and water is respectively 40-70 weight part, 40-70 weight part.
4. method according to claim 1, wherein, described rich ore powder is that iron-holder is that 50 weight % are above, particle diameter is a iron ore raw material more than the 40 weight % less than the grain size content of 0.074mm.
5. method according to claim 4, wherein, in described first compound amount of rich ore powder be rich ore powder in described second compound amount greater than 0 weight % to smaller or equal to 50 weight %, described first compound passes through rich ore powder, flux, fuel and water are mixed to be got, flux with respect to 100 weight parts, the consumption of described rich ore powder is to smaller or equal to 900 weight parts greater than 0, the consumption of fuel and water is respectively the 40-70 weight part, the 40-55 weight part, in described first compound, particle diameter is the 40-90 weight % of rich ore powder total amount in described first compound less than the content of the rich ore powder of 0.074mm.
6. method according to claim 1 or 5, wherein, described rich ore powder is one or more in v-ti magnetite concentrate, common iron ore concentrate or the ground hematite.
7. method according to claim 1 wherein, also contains the assorted material of iron content and/or returns mine in first compound, with respect to the flux of 100 weight parts in first compound, assorted material of described iron content and the total amount of returning mine are the 250-350 weight part.
8. method according to claim 1, wherein, described flux is unslaked lime and/or Wingdale.
9. method according to claim 1, wherein, described fuel is coke powder or pulverized anthracite, and the carbon content in the described fuel is 65-84 weight %.
10. method according to claim 1, wherein, this method also comprises carries out sintering with the granulation products therefrom.
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| CN107267750B (en) * | 2017-07-04 | 2019-05-28 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of granulating of high-chromic vanadium-titanium ferroferrite sinter mixture |
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